had some guys from southwest research tell me that with synthetics there is almost no difference, but with dino there is plenty and in their research castrol gtx faired the best. pennzoil was at the bottom of the spectrum, valvoline was near the top.
I also use wix filters, if you perfer NAPA or something, they are the same. Napa Gold=WIX. Oreillys sales wix, i dont know who else does.
Yeah I've heard that about pennzoil too, supposedly its parafin based and will get nasty if it sits for a while (i think). I've had my valve covers off and it was so clean in there I could eat off of it so I don't really see where they're coming from.
i heard fram was cheap filter, o well everytone seems to go with wix....so its all good i looked into those K&N filters but coulden't bring myself to spend 12 bucks on something that gonna get tost in 500 miles
Shell Rotella and Delo 400 are both very popular among the diesel crowd. For full synthetics, most of the oil-burner guys like Red Line, Royal Purple or Amsoil. A bypass filtration system is also popular.
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